CN201742599U - High power factor constant current driving circuit - Google Patents
High power factor constant current driving circuit Download PDFInfo
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- CN201742599U CN201742599U CN2010201941813U CN201020194181U CN201742599U CN 201742599 U CN201742599 U CN 201742599U CN 2010201941813 U CN2010201941813 U CN 2010201941813U CN 201020194181 U CN201020194181 U CN 201020194181U CN 201742599 U CN201742599 U CN 201742599U
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- power factor
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- switching tube
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model discloses a high power factor constant current driving circuit, which comprises a rectifier bridge, a BUCK power factor main correcting circuit, a PFC control circuit and a load current control circuit, wherein the input end of the BUCK power factor main correcting circuit is the output end of the rectifier bridge, the BUCK power factor main correcting circuit at least comprises a switching tube, a diode and an inductor, the switching tube is connected with the positive output end of the rectifier bridge, a sampling resistor in the load current control circuit is connected in series between the inductor and the switching tube, the joint of the switching tube and the sampling resistor is also connected with the cathode of the diode, the anode of the diode is connected with the negative output end of the rectifier bridge and is used as the negative output end of the BUCK power factor main correcting circuit, and the positive output end of the BUCK power factor main correcting circuit is one end of the inductor; the output end of the PFC control circuit directly drives the switching tube; and the joint of the switching tube and the sampling resistor is the common reference site of the PFC control circuit and the load current control circuit.
Description
Technical field
The utility model relates to a kind of drive circuit, is specially a kind of high power factor constant current drive circuit.
Background technology
Now, high energy efficiency, energy-saving and environmental protection etc. have become the universal demand of society to light source.LED (LightEmitting Diode, that is: light-emitting diode) is widely used in recent years a kind of novel energy-conserving light source.Because LED is the semiconductor device of characteristic sensitivity, has negative temperature characteristic again, thereby in application process, need it is carried out steady-working state and protection, thereby produced the notion that drives.Near harshness, LED can directly connect the electric main of 220V unlike common incandescent lamp bulb to the LED device to the requirement of driving power.LED is 2～3 volts a low voltage drive, so must consider factors such as effective power, constant current accuracy, power source life, electromagnetic compatibility during the design driven circuit again.
Existing LED constant-current drive circuit generally all adopts BUCK power factor correction main circuit, that is: buck translation circuit, specifically: valley fill type PPFC (Passive Power Factor Correction) (PFC) circuit+constant current control BUCK circuit.This scheme has been improved the power factor of driver, the BUCK circuit of the control of constant current simultaneously has the circuit arrangement of many maturations and control chip available, but the shortcoming of this scheme is that power factor (PF) value of valley fill type PPFC (Passive Power Factor Correction) (PFC) circuit is still not high enough, and that the low explanation of power factor circuit is used for the reactive power of alternating magnetic field conversion is big, reduced usage ratio of equipment and increased the line powering loss, and actuator power is difficult to satisfy the requirement of some standards of lighting field to the power supply unit input harmonic current when big.For improving power factor, reduce input current harmonics, directly realize simultaneously that with the BUCK circuit power factor correction (PFC) and constant current control are optional schemes.Traditional BUCK type PFC control circuit load current of need sampling considers will guarantee to export the high-pressure side or the low-pressure end equipotential of an end and input from electromagnetic compatibility simultaneously.
Prior art one provides a kind of LED constant-current drive circuit, please refer to shown in Figure 1ly, and this circuit comprises rectifier bridge BD, BUCK power factor correction main circuit, PFC control circuit, load current control circuit.BUCK power factor correction main circuit is by MOSFET Q, diode D, and inductance L, first capacitor C 1 is formed.The PFC control circuit is made up of the control chip IC and the first accessory power supply Vcc1.Load current control circuit is by integrated operational amplifier OA, first resistance R, 1, the second resistance R, 2, the three resistance R, 3, the second capacitor C 2, and sampling resistor Rs, the optocoupler OP and the second accessory power supply Vcc2 form.
Wherein, AC power is the input of rectifier bridge BD, the source electrode of MOSFET Q connects rectifier bridge BD output negative terminal, the drain electrode of MOSFET Q connects the anode of diode D and an end of inductance L, the negative electrode of diode D connects the anode of output voltage V o, the end of another termination sampling resistor Rs of inductance L and the negative terminal of first capacitor C 1, and this tie point is masked as signal ground, the output plus terminal of the described BUCK power factor correction of another termination main circuit of first capacitor C 1, the negative terminal of another termination output voltage V o of sampling resistor Rs, the anode of the Vcc termination first accessory power supply Vcc1 of control chip IC, the negative terminal of the first accessory power supply Vcc1 is rectifier bridge BD output ground, the gate pole of the Gate termination MOSFET Q of control chip IC, the GND termination rectifier bridge BD output ground of control chip IC and the emitter of optocoupler OP phototriode, the collector electrode of the FB termination optocoupler OP phototriode of control chip IC, the diode anode of optocoupler OP connects an end of first resistance R 1, the anode of another termination second accessory power supply Vcc2 of first resistance R 1, the negative terminal of the second accessory power supply Vcc2 connects signal ground, the negative electrode of the diode of the output termination optocoupler OP of integrated operational amplifier OA, the power supply of integrated operational amplifier OA is the second accessory power supply Vcc2, the positive input of integrated operational amplifier OA meets reference power supply Vref, the reverse input end of integrated operational amplifier OA connects an end of second resistance R 2, the negative terminal of another termination output voltage V o of second resistance R 2.Because the ground end of the control chip IC of PFC control circuit links to each other with the source electrode of MOSFET Q, so control IC is driven MOS FET Q directly, though this circuit utilizes BUCK power factor correction main circuit to realize power factor correction and constant current control, but, load current control circuit and PFC control circuit are not altogether, need optocoupler to realize isolated feedback, also need simultaneously for two not altogether the control circuit on ground accessory power supply (that is: the first accessory power supply Vcc1 and the second accessory power supply Vcc2) is provided respectively, so this LED constant-current drive circuit complex structure and cost are higher.
In order to address the above problem, prior art two has proposed a kind of LED constant-current drive circuit as shown in Figure 2, different with prior art one is: MOSFET Q source electrode connects diode D negative electrode, its drain electrode connects rectifier bridge BD output plus terminal, the negative electrode of one terminating diode D of inductance L, the anode of its another termination output voltage V o, the anode of diode D connects the end of rectifier bridge BD output ground and sampling resistor Rs, the negative terminal of another termination output voltage V o of sampling resistor Rs, the Gate termination isolation of control chip IC or the input of bootstrapping drive circuit, the gate pole of the output termination MOSFET Q of isolation and bootstrapping drive circuit.MOSFET Q, diode D, isolation or bootstrapping drive circuit and inductance L are formed BUCK power factor correction main circuit, control chip IC forms the PFC control circuit, sampling resistor Rs, second resistance R 2, the 3rd resistance R 3, the second capacitor C 2 and integrated operational amplifier OA form load current control circuit.
The LED constant-current drive circuit of prior art two, sampling resistor Rs links to each other with the negative terminal of rectifier bridge BD output, PFC control circuit and load current control circuit are altogether, do not need the light-coupled isolation feedback, but the drive signal of PFC control circuit is driven MOS FET Q directly, also need complicated isolation or bootstrapping drive circuit, this LED constant-current drive circuit structure is complicated too and increased cost undoubtedly.
The LED constant-current drive circuit that prior art three provides as shown in Figure 3, the current sampling circuit 440 and the input voltage sample circuit 420 that include MOSFET Q, with the input voltage sampled signal of BUCK power factor correction main circuit as reference signal, the electric current of control MOSFET Q, thereby realize control, can improve the power factor of input simultaneously load current; But this circuit input current is a square wave, and power factor is not high, and owing to the electric current of the MOSFET Q source class of only sampling does not have the Direct Sampling load current, the output constant-current control accuracy is not high.
The utility model content
The utility model embodiment provides a kind of high power factor constant current drive circuit, has solved constant-current drive circuit complex structure in the prior art, and because power factor is not high, and influence the problem of constant-current control accuracy.
The utility model embodiment provides a kind of high power factor constant current drive circuit, comprising: rectifier bridge, BUCK power factor correction main circuit, PFC control circuit and load current control circuit,
The output that is input as rectifier bridge of described BUCK power factor correction main circuit, wherein, described BUCK power factor correction main circuit comprises at least: switching tube, diode and inductance, described switching tube is connected with the output plus terminal of described rectifier bridge, sampling resistor in the described load current control circuit is serially connected between described inductance and the described switching tube, and the common point that described switching tube is connected with sampling resistor also is connected with the negative electrode of described diode, the anode of described diode is connected with the output negative terminal of rectifier bridge and as BUCK power factor correction main circuit output negative terminal, described BUCK power factor correction main circuit output plus terminal is an end of described inductance;
The direct driving switch pipe of the output of described PFC control circuit;
The common point that described switching tube is connected with sampling resistor is the common reference ground of PFC control circuit and load current control circuit.
Compared with prior art, the utility model embodiment has the following advantages:
1.PFC control circuit and load current control circuit are altogether, only need a power supply accessory power supply, load current control does not need light-coupled isolation, and circuit structure is simple, and cost is low.
2.PFC control circuit can directly drive the switching tube of BUCK power factor correction main circuit, drive circuit is simple, and driving power consumption is low.
3. load current control circuit can directly be realized the feedback to load current mean value, precision of steady current height.
Thereby, on the basis of simplifying the constant-current drive circuit structure, improved power factor, guaranteed the precision of constant current control.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment and technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment and the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the LED constant-current drive circuit schematic diagram of prior art one;
Fig. 2 is the LED constant-current drive circuit schematic diagram of prior art two;
Fig. 3 is the LED constant-current drive circuit schematic diagram of prior art three;
The circuit diagram of a kind of constant-current drive circuit that Fig. 4 provides for the utility model embodiment;
The circuit diagram that Fig. 5 provides for the utility model embodiment based on a kind of boundary Control constant-current drive circuit of Fig. 4;
Fig. 6 is based on BUCK power factor correction main circuit inductive current oscillogram under Fig. 5 boundary Control mode.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
Please refer to shown in Figure 4, the circuit diagram of a kind of constant-current drive circuit that Fig. 4 provides for the utility model embodiment.This constant-current drive circuit comprises: rectifier bridge BD, BUCK power factor correction main circuit, PFC control circuit and load current control circuit.
Described BUCK power factor correction main circuit comprises MOSFET Q, diode D, inductance L;
Described PFC control circuit comprises control chip IC;
Described load current control circuit comprises integrated operational amplifier OA, first resistance R 1, second resistance R 2, sampling resistor Rs and compensating network.
Particularly:
As Fig. 4, described BUCK power factor correction main circuit, be connected between rectifier bridge and the output voltage V o, wherein the drain electrode of MOSFET Q connects rectifier bridge BD output plus terminal, the source electrode of MOSFET Q connects the negative electrode of diode D and the end of sampling resistor Rs, and points of common connection is held with being masked as an end of another termination inductance L of sampling resistor Rs, the anode of another termination output voltage V o of inductance L, the anode of diode D connect the negative terminal of rectifier bridge BD output negative terminal and output voltage V o; The anode of the Vcc termination accessory power supply Vcc of control chip IC, the negativing ending grounding of accessory power supply Vcc, the gate pole of the Gate termination MOSFET Q of control chip IC, the GND end ground connection of control chip IC, the output of the Comp termination integrated operational amplifier OA of control chip IC and an end of compensating network, the power supply of integrated operational amplifier OA is accessory power supply Vcc, the positive input of integrated operational amplifier OA meets reference power supply Vref, the reverse input end of integrated operational amplifier OA connects an end of first resistance R 1, one end of second resistance R 2 and the other end of compensating network, another termination accessory power supply Vcc anode of first resistance R 1, the other end of another termination sampling resistor Rs of second resistance R 2.
Output at BUCK power factor correction main circuit can filter capacitor in parallel.
The utility model embodiment is the output plus terminal that MOSFET Q is placed on rectifier bridge BD, the end of the filter inductance L of described BUCK power factor correction main circuit is connected by the source electrode of current sampling resistor Rs and the MOSFET Q of BUCK power factor correction main circuit, and the diode negative terminal of described BUCK power factor correction main circuit is connected on the points of common connection of the source electrode of BUCK power factor correction main circuit MOSFET Q and load current sampling resistor Rs; The points of common connection of the MOSFET Q of described BUCK power factor correction main circuit and load current sampling resistor Rs is the common reference ground of PFC control circuit and load current control circuit.Therefore, the constant-current drive circuit of the utility model embodiment only needs an accessory power supply Vcc, and described PFC control circuit can directly drive the MOSFET Q of described BUCK power factor correction main circuit, and then has simplified the structure of drive circuit and reduced the power consumption that drives.
In addition, load current sampling resistor Rs described in the utility model embodiment Fig. 4 does not have the Direct Sampling load current, but the electric current of the inductance L of the described BUCK power factor correction main circuit of sampling, the current average of inductance L and the mean value of load current equate, therefore load current control circuit can directly be realized feedback to current average having reached the control of constant-current driving and the precision height of current stabilization by the electric current of sampling inductance L.
Need to prove: the MOSFET Q that mentions among the utility model embodiment, be essentially a switching tube, this switching tube can also be replaced for triode or insulated gate bipolar power tube (IGBT) wait, realize function corresponding, the utility model embodiment is that example illustrates the function that drive circuit will reach with MOSFET Q only, but which kind of components and parts of concrete employing of limit switch pipe are not realized.
Please refer to Fig. 5, the circuit diagram of the constant-current drive circuit of another embodiment that Fig. 5 provides based on Fig. 4 for the utility model;
Fig. 5 is that a kind of of the utility model embodiment is the circuit of the realization constant-current driving purpose of example with the boundary Control, described BUCK power factor correction main circuit, load current control circuit are identical with the execution mode of Fig. 4, and the control chip IC of different is described PFC control circuit is a boundary Control.That is: control chip IC also comprises ZCD end, i.e. zero passage detection pin.Operation principle is: when sampling resistor Rs samples the current over-zero of inductance L of BUCK power factor correction main circuit, it is the level of conducting that control chip IC driving output makes MOSFET Q, after the conducting Ton time, control chip IC drives output and makes the level of MOSFET Q for turn-offing under the effect of load current control circuit, realizes the boundary Control pattern of inductance L electric current; Therefore present embodiment also comprises a zero cross detection circuit, the ZCD end of its output termination control IC, and input is connected between inductance L and the sampling resistor Rs.Similarly, present embodiment has improved power factor on the basis of simplifying the constant-current drive circuit structure, has guaranteed the precision of constant current control.
Further, please refer to Fig. 6, Fig. 6 is for being based on BUCK power factor correction main circuit inductive current oscillogram under Fig. 5 boundary Control mode.Wherein the ordinate among (a) figure of Fig. 6 is input voltage vin and output voltage V o, and abscissa is time t; Ordinate among (b) figure of Fig. 6 is inductive current I
L, abscissa is time t, Ton is fixing duration.
Fig. 6 (a) and Fig. 6 (b) are depicted as, and under certain input voltage vin, when input voltage vin during greater than output voltage V o, the Ton duration is fixed, inductive current I in same period T/2 of electrical network
LPeak value and input voltage vin in direct ratio, so inductive current I
LMean value and input voltage vin same-phase, therefore can be used as circuit of power factor correction.And then make load current control circuit can directly realize feedback to load current mean value, it is high and realize the order of High Power Factor LED constant-current driving to reach precision of steady current.
By the utility model the foregoing description, can on the basis of simplifying the constant-current drive circuit structure, improve power factor, guaranteed the precision of constant current control.
Need to prove, in this article, relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint and have the relation of any this reality or in proper order between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.
The preferred implementation of a kind of constant-current drive circuit that the above only provides for the utility model does not constitute the qualification to the utility model protection range.Circuit among this embodiment is built the mode of building that is not limited among the embodiment, any any modification of being done within spirit of the present utility model and principle, is equal to and replaces and improvement etc., all should be included within the claim protection range of the present utility model.
Claims (7)
1. high power factor constant current drive circuit, comprising: rectifier bridge, BUCK power factor correction main circuit, PFC control circuit and load current control circuit is characterized in that:
The output that is input as rectifier bridge of described BUCK power factor correction main circuit, wherein, described BUCK power factor correction main circuit comprises at least: switching tube, diode and inductance, described switching tube is connected with the output plus terminal of described rectifier bridge, sampling resistor in the described load current control circuit is serially connected between described inductance and the described switching tube, and the common point that described switching tube is connected with sampling resistor also is connected with the negative electrode of described diode, the anode of described diode is connected with the output negative terminal of rectifier bridge and as BUCK power factor correction main circuit output negative terminal, described BUCK power factor correction main circuit output plus terminal is an end of described inductance;
The direct driving switch pipe of the output of described PFC control circuit;
The common point that described switching tube is connected with sampling resistor is the common reference ground of PFC control circuit and load current control circuit.
2. constant-current drive circuit according to claim 1 is characterized in that, described PFC control circuit is connected same accessory power supply Vcc with load current control circuit.
3. constant-current drive circuit according to claim 1, it is characterized in that, described BUCK power factor correction main circuit also comprises a filter capacitor, the positive pole of described filter capacitor is connected the common point that described sampled point unit links to each other with output voltage V o anode, and the negative pole of described filter capacitor is connected with the negative terminal of output voltage V o.
4. constant-current drive circuit according to claim 1 and 2 is characterized in that, described switching tube is MOSFET, insulated gate bipolar power tube or triode.
5. constant-current drive circuit according to claim 4 is characterized in that, when switching tube was MOSFET, the drain electrode of described MOSFET was connected with the output plus terminal of rectifier bridge, and the source electrode of described MOSFET is connected with the negative electrode of described diode.
6. constant-current drive circuit according to claim 5 is characterized in that, described PFC control circuit comprises: control chip IC; Described control chip IC comprises: Vcc end, Gate end, Comp end and GND end; Wherein,
The anode of the Vcc termination accessory power supply Vcc of described control chip IC, the gate pole of Gate termination MOSFET pipe, GND holds ground connection, the output of integrated operational amplifier OA in the Comp termination load Control current control circuit.
7. constant-current drive circuit according to claim 6 is characterized in that, described control chip IC also comprises: the ZCD end, and described drive circuit also comprises zero cross detection circuit, wherein,
The input signal of described zero cross detection circuit is the detection signal of inductive current, and its output is connected in the ZCD end of described control chip IC.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201941813U CN201742599U (en) | 2010-05-12 | 2010-05-12 | High power factor constant current driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010201941813U CN201742599U (en) | 2010-05-12 | 2010-05-12 | High power factor constant current driving circuit |
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| CN2010201941813U Expired - Lifetime CN201742599U (en) | 2010-05-12 | 2010-05-12 | High power factor constant current driving circuit |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102244954A (en) * | 2010-05-12 | 2011-11-16 | 英飞特电子（杭州）有限公司 | Constant current drive circuit with high power factor |
| CN102684492A (en) * | 2012-05-11 | 2012-09-19 | 杭州电子科技大学 | High power factor converter |
| CN102801296A (en) * | 2012-08-27 | 2012-11-28 | 无锡安邦电气有限公司 | Switching power supply output peak eliminating circuit |
| CN102858048A (en) * | 2011-06-30 | 2013-01-02 | 海洋王照明科技股份有限公司 | LED driving circuit and LED lamp |
| CN102969915A (en) * | 2012-11-19 | 2013-03-13 | 深圳市明微电子股份有限公司 | High-power-factor constant current control circuit |
| CN103023300A (en) * | 2011-09-26 | 2013-04-03 | 英飞特电子（杭州）股份有限公司 | Constant-current control circuit capable of correcting power factors and power factor correcting circuit |
| CN103178704A (en) * | 2011-12-20 | 2013-06-26 | 英飞特电子（杭州）股份有限公司 | Peak current controlled power factor compensation circuit |
| CN105099236A (en) * | 2015-06-26 | 2015-11-25 | 天长市富安电子有限公司 | Power supply circuit of virtual channel connection (VCC) auxiliary power supply |
| CN107371299A (en) * | 2017-08-29 | 2017-11-21 | 无锡麟力科技有限公司 | The linear constant current LED drive circuit and driving method of a kind of High Power Factor |
| CN113765360A (en) * | 2021-09-03 | 2021-12-07 | 株洲市众普森技术有限公司 | Method for improving interleaved PFC light load efficiency |
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2010
- 2010-05-12 CN CN2010201941813U patent/CN201742599U/en not_active Expired - Lifetime
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102244954A (en) * | 2010-05-12 | 2011-11-16 | 英飞特电子（杭州）有限公司 | Constant current drive circuit with high power factor |
| CN102858048A (en) * | 2011-06-30 | 2013-01-02 | 海洋王照明科技股份有限公司 | LED driving circuit and LED lamp |
| US9240711B2 (en) | 2011-09-26 | 2016-01-19 | Inventronics (Hangzhou), Inc. | Constant current control circuit with PFC function and its PFC circuit |
| CN103023300A (en) * | 2011-09-26 | 2013-04-03 | 英飞特电子（杭州）股份有限公司 | Constant-current control circuit capable of correcting power factors and power factor correcting circuit |
| CN103023300B (en) * | 2011-09-26 | 2015-03-18 | 英飞特电子（杭州）股份有限公司 | Constant-current control circuit capable of correcting power factors and power factor correcting circuit |
| CN103178704A (en) * | 2011-12-20 | 2013-06-26 | 英飞特电子（杭州）股份有限公司 | Peak current controlled power factor compensation circuit |
| CN103178704B (en) * | 2011-12-20 | 2015-10-21 | 英飞特电子（杭州）股份有限公司 | A kind of power factor compensation circuit being applicable to peak value comparison method |
| CN102684492A (en) * | 2012-05-11 | 2012-09-19 | 杭州电子科技大学 | High power factor converter |
| CN102801296A (en) * | 2012-08-27 | 2012-11-28 | 无锡安邦电气有限公司 | Switching power supply output peak eliminating circuit |
| CN102801296B (en) * | 2012-08-27 | 2014-09-10 | 无锡安邦电气有限公司 | Switching power supply output peak eliminating circuit |
| CN102969915A (en) * | 2012-11-19 | 2013-03-13 | 深圳市明微电子股份有限公司 | High-power-factor constant current control circuit |
| CN102969915B (en) * | 2012-11-19 | 2016-03-02 | 深圳市明微电子股份有限公司 | A kind of High-power-factor constant current control circuit |
| CN105099236A (en) * | 2015-06-26 | 2015-11-25 | 天长市富安电子有限公司 | Power supply circuit of virtual channel connection (VCC) auxiliary power supply |
| CN105099236B (en) * | 2015-06-26 | 2017-11-17 | 天长市富安电子有限公司 | A kind of VCC accessory power supplys power supply circuit |
| CN107371299A (en) * | 2017-08-29 | 2017-11-21 | 无锡麟力科技有限公司 | The linear constant current LED drive circuit and driving method of a kind of High Power Factor |
| CN107371299B (en) * | 2017-08-29 | 2023-09-19 | 无锡麟力科技有限公司 | Linear constant-current LED driving circuit with high power factor and driving method |
| CN113765360A (en) * | 2021-09-03 | 2021-12-07 | 株洲市众普森技术有限公司 | Method for improving interleaved PFC light load efficiency |
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| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309 Patentee after: LED One (Hangzhou) Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309 Patentee before: Inventronics (Hangzhou) Co., Ltd. Address after: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309 Patentee after: LED One (Hangzhou) Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309 Patentee before: Inventronics (Hangzhou) Co., Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20110209 |
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| CX01 | Expiry of patent term |